Primary battery.



E. E. HUDSON & D. BLMES.

' PRIMARY BATTERY.

y APPLIOTION FILED SEPT. 19I 1910. A

. nErna]f3 STATES 10 of which the following a description.

' Our in ventionrelates to primary batteries, l

- 1 5 Vuser of the approaching exhaustion o f the 35 tion of the cell suliciently thin,4 it w1l1 wear S or less'evenly under the action of theelee-l .PATENT OFFICE;

"j" ELISHA' E. HUnsoN, o E NEWARK, AND nEvEREUx ELMEs, o r ORANGE, NEW JERSEY,

' t. 'ERIMAEY 0F WEST ORANGE, NEW JERSEY, A. CQRPRATION 0F JERSEY'.

Speeicationo'f :Letters Patent.

'ro' THOMAS A. EDISON,

NooRPoRATEn,

BATTEEE.

- Patented May 13,1 91 3.

Appueanqn mea separater 19,1910. seriaim'. 582,608.

To all whom-inlay concern: 4' v v I Beit known that we, ELISHA'E. HUnsoN, a citizen of the United States and a resldent of Newark, in the county of ssex and State 5 of New4 Jersey? and DEVEREUX Enamsfacitizen of the Unlted States, and a resident of Orange, in the countyk of Essexand State of' 'New Jersey, have invented certain new and useful Improvements in Primary .'Battenes,

and the object thereof-iste provide-anelec-f trede plate for such batteries furnished wlth lmeans for giving advance indication to the the same. A f Our invention relates particularly. to primary batteries of that.I class in :which-the negative electrode consists in a plate of oxidof copperor other depolarizingagent. and .the positive electrode consists .of a plate'or latesvof zinc. -A battery of this'l character 1s described in patentfto Do e N o; 894,487', for primary batteries,` ante" July 28,1908.

In a battery ofthisc aracter, thepositive 'plates wearaway during the electrolytie 'action quite evenly.' J L The indicating means contemplated.byl our invention consists in forming a small depression on the side o f a positive plate farthest away fromthe negative plate -with'which` 1t coacts in the battery. When -the posit-ive plate -has been worn by the electrolytic acplate, so that he maybe prepared to renew through in one ormore small holes vin the depressed portion of the p'late, thereby indieating to the user that the plate will have to be renewed shortly, say in from two to four 40 'weekstime Preferably, we make the small depression of a circular shape'and surround the same with a raised rim'jor locatingthe spot which the usershould watch for signs of wear. Otl1er, 1neans may, "-.ptoweven be.

used to mark the depressed po -ionofthe plate if desired, as will be obvious,

Ouninventlon 1s notliniited to batteries the classdescribed, but is applicable to any batteries using plates which wear away more trolyte.-

clearly understood, attention is hereby directed to the accompanying drawings formin partof this specification, in whieh '55 i ure 1 represents Aa side elevation of the positive electrode plate equippedwith our '1nvent1on. Fig. 2 is a" section of the samev "taken on line 2-.2of Fig. l; and Fig. 3 is an-enlarged cross sectional detail of a portionjof anlelectrode plate which has worn .throu h the indicating depression.

Re erring to'the drawings, the electrode plateljis provided with Aone or two or more depressed ortions 2 which are preferably 65 circular and slightly concave.' The d 'epth of 'these depressions need only be very slight. Depressione 2 are surrounded by annular flanges 3. In Fig.. 3 the electrode plate l has worn suiliciently thin to 've advance indi- 70 Y with' which it coacts, for indicating the ap- 80 proaching necessity for renewal, vsubstantially as described.

2.`In a primary battery, a positive plate f having a small circulaidepression on the side 'farthest away from the negative clement 55 I with which it coacts, to indicate the ap'7 p roaehinfr necessity for renewal ofthe plate after suffi-)cient service 'in lhe battery, byl the appearance of a' hole throughthejsame, sub. stantially as described.. V

3. As a new article of manufactureAa-n electrode plateVfor a voltaic battery comprising a Hat plate having means for indieating visually the approaching necessity-for lrenewal of the plate when the 95.v

#worn thin in-use in a voltaic battery In prisin'ga-small de ression'fin' nesurfaceljofthe plate surroun ed by'aif raised rim, "s'ubstantially as described. ff '4...'As af'new article of manufacture, an electrode'plate. for a voltaic battery comprisinggla flat plate having means for indi' cating'fy'isnally the :approaching necessity In order that our invention may be more for renewal of the plate when-the latter has Vworn use-.in o. voit-aio Battery, commined entent of .consumption lof the plate,

zprising:atsnoall'depressionginonesuraee of substantially as described.l

.thepiateandvmeans for'indicatin vthe loa?l f tionf of. the depression, substantia y as dermary tte ,-tve-:plutegm `re'dl'iced thickness, iuwhch portion the plate is adapted first to wear through in the opera- Y 10 tiorifjofthe;battery tofndicabea predeten' remove-bile posiving sm portion thereof of This specification signed and witnessed at West Orange, Essex county, New Jersey, this 15th, `day of September, 1910.

` ELISHA E. HUDSON. 4 DEVEREUX ELMES.

Witnesses:

Dm SMITH, kr ANNA R. KLEHM. 

